Foreign Currencies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Foreign Currency Balance [Line Items]
Investment subject to foreign currency fluctuations	$ 15,710
Cumulative foreign currency translation loss, net of deferred income tax benefit	(34,326)	$ (37,702)
Income tax (benefit) expense	(51,081)	$ (54,205)	$ 37,283
Foreign Currency Exchange Gain (Loss), Net
Schedule Of Foreign Currency Balance [Line Items]
Income tax (benefit) expense	$ 0